Version Control System

5 minutes 5 Questions

A version control system (VCS) is a tool that helps manage changes to source code over time, making it an essential component of continuous integration and continuous delivery (CI/CD) pipeline. It enables multiple developers to work concurrently on the same source code without conflict, keeps track of changes made by linking them to the developer responsible, and provides the ability to revert to previous versions if necessary. The VCS ensures efficient collaboration among team members while preserving the integrity of the codebase, thus assisting in seamless project development.

Guide and Exam Tips: Version Control System

What is Version Control System?
A version control system (VCS) is a tool that allows multiple individuals to work on a project at the same time. It is essential in collaborative environments to manage code changes and prevent conflicts in the code.

Why is it Important?
VCS is important as it provides a history of code changes, allows for code branching and merging, and aids in finding bugs or other issues with the code. It also gives the ability to revert a code base back to a previous state if necessary.

How it works?
It works by saving different versions of the code. You can commit changes to the VCS which saves that current state of the project, allowing you or others to return to this state at any point.
Exam Tips: Answering Questions on Version Control System
1. Understand the terminology: Make sure you know the difference between terms like 'commit', 'push' and 'pull'.
2. Understand how to use it: Basic commands for a VCS (like Git) can come up in exams, so be sure you know how to perform common tasks like creating a repository, making commits, and resolving merge conflicts.
3. Preparing for scenario-based questions: You might be presented with a situation where multiple people are working on a project. Understand how a VCS can solve or prevent problems in these cases.

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Question 1

You need to find out who contributed to a specific file in your repository. What command should you use?

git author git log git find git blame git show git contributor

Correct Answer: git blame

The 'git blame' command displays the author of each line in the specified file, allowing you to quickly identify who contributed to the file.

Question 2

You added a sensitive file to the repository by mistake and pushed it. What should you do to remove the file from the repository's history?

Replace the sensitive file with a fake one Ask team members not to access the file Use a history-rewriting command to remove the file and push the changes Delete the file and push the changes Edit the file to remove sensitive information Create a new repository and move the files there

Correct Answer: Use a history-rewriting command to remove the file and push the changes

Using a history-rewriting command allows you to delete any trace of the file from the repository's history, ensuring the sensitive information is completely removed.

Question 3

A team member has accidentally pushed an incomplete feature to the master branch. What is the best approach to fix it?

Ask the team to ignore the incomplete feature Force-push the previous version without the incomplete feature Manually remove the feature from the master branch Revert the commit, push the corrected version, and share it as an update Delete the branch with the incomplete feature Leave the incomplete feature and fix it over time

Correct Answer: Revert the commit, push the corrected version, and share it as an update

Reverting the commit allows to undo the changes while maintaining the repository's history, ensuring a clean, coherent, and transparent workflow.

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